- Clean iPhone charging port very well with toothbrush and isopropyl alcohol. If still problem, next step would be replacement of charging port assembly with flex cable, lower mic, and home button flex connector, all a single part.
- Next step would be to clean dock port with isopropyl alcohol. If still problem, replace charging port assembly. If still problem, then most likely logic board fault.
- Looks like a broken off corner screen mount. If that is what it is, it is not important.
- Reset, hold both home and power buttons for about 10 seconds until the iPhone begins to restart. If still nothing, possibly the LCD Display connector is not correctly seated down to the logic board, check your work. If it still does not work you may have purchased a faulty screen. The small gold piece, goes under the top left screw of the logic board, the one that was under the black tape. The F prongs go at top of iPhone behind camera.
- The charging port assembly has a small connector for the home button flex golden parts. The charging port connector has a small clamp which must be lifted, if you removed the old home button flex correctly it should be lifted already. Then carefully slide the flex golden parts into the connector, this is very tedious, so take your time, be careful, after it is inserted, you just push the clamp back down.
- The top battery is iPhone 4S, the lower iPhone 4. You are correct the iPhone 4S battery connector has two screw holes and the iPhone 4 only one. Surely a mixup.
- ATT or GSM logic board has no chance of fitting. CDMA, Sprint or Verizon has little chance of fitting. I would actually say no chance for either fitting iPhone 4S chassis.
- Did you reconnect the home button flex to the new charge port connector? Or home button flex is not connected correctly. Home button flex could have been damaged during repair. New charge port may be faulty.
- No. The rear panel itself, does not need to be on to charge or even use the iPhone for testing purposes.
- Some have reported using toe nail clippers very carefully to grab the screw head and remove the screw.
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